Lose the case? Felicity Jones looks downtrodden as she takes on the role of Supreme Court Justice Ruth Bader Ginsburg to film On The Basis of Sex

She's become one of the hottest actresses in Hollywood, receiving an Oscar nomination for her work in The Theory of Everything, and gaining fan-boy recognition for her lead role in Rogue One: A Star Wars Story.

But Felicity Jones appeared more downtrodden than delighted on Sunday, as she was spotted filming scenes for her upcoming legal biopic On The Basis of Sex.

The 34-year-old actress was spotted in classic 1950s clothing for the scenes in Montreal, to play US Supreme Court Justice Ruth Bader Ginsburg.

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Melancholy: Felicity Jones appeared more downtrodden than delighted on Sunday, as she was spotted filming scenes for her upcoming legal biopic On The Basis of Sex

Rocking a double-breasted teal coat and red lip, Felicity looked as if she had stepped right out of the cinematic golden age as she filmed the scenes.

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The Inferno star rocked the coat with an adorning brooch, before changing into a burgundy dress and heels for shooting later on in the day.

The brunette beauty had her bobbed locks styled into simple curls, and accessorised both her looks with a red lip as she was seen shooting scenes as the hard-as-nails legal maven.

Felicity took on the role of Ginsberg after Natalie Portman dropped out of the film, shortly after welcoming her daughter Amelia, although it is not known whether this is the reason she chose not to take part.

Changing up her look: The 34-year-old actress was spotted in classic 1950s clothing for the scenes in Montreal, to play US Supreme Court Justice Ruth Bader Ginsburg

Inspired: Felicity will play US Supreme Court Justice Ruth Bader Ginsburg (L) in the early days of her legal career. The film documents Ruth's rise to becoming a US Supreme Court Justice

Vintage vibes: Rocking a double-breasted teal coat and red lip, Felicity looked as if she had stepped right out of the cinematic golden age as she filmed the scenes

On The Basis of Sex will document Ruth's rise to becoming a US Supreme Court Justice, the first Jewish woman to do so.

Felicity will co-star in the film with Armie Hammer, who will play Ruth's real-life husband Marty and it seems the film will also show the pair's nuptials.

The star was spotted on set last month rocking a stunning bridal gown for the film.

Other stars appearing the film include Misery star Kathy Bates and Leftovers star Justin Theroux, and the flick will be directed by Mimi Leder.

While the film does not yet have a release date, it is expected to hit cinemas in 2018 in line with the 25th Anniversary of Ginsberg's time as a Supreme Court Justice.

Co-star: Felicity will co-star in the film with Armie Hammer, who will play Ruth's real-life husband Marty and it seems the film will also show the pair's nuptials